US7602793B2 - Method of blocking alert messages to mobile units - Google Patents
Method of blocking alert messages to mobile units Download PDFInfo
- Publication number
- US7602793B2 US7602793B2 US11/304,066 US30406605A US7602793B2 US 7602793 B2 US7602793 B2 US 7602793B2 US 30406605 A US30406605 A US 30406605A US 7602793 B2 US7602793 B2 US 7602793B2
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- Prior art keywords
- base station
- mobile unit
- message
- page
- designated security
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
Definitions
- This invention relates generally to communication systems, and, more particularly, to wireless communication systems.
- the coverage area of a wireless communication system is typically divided into a number of cells, which may be grouped into one or more networks.
- Mobile units located in each cell may access the wireless communications system by establishing a wireless communication link, often referred to as an air interface, with a base station associated with the cell.
- the mobile units may include devices such as mobile telephones, personal data assistants, smart phones, Global Positioning System devices, wireless network interface cards, desktop or laptop computers, and the like.
- Mobile units may initiate communication with a base station by providing a signal on an access channel. The base station may then use the received access channel signal to establish the wireless communication link between the mobile unit and the base station on a separate traffic channel. The mobile unit and the base station may then exchange messages over the air interface using the traffic channel.
- the base station may also initiate communication with the mobile unit. For example, the base station may receive a signal indicating that another user has placed a call destined for the mobile unit. The base station may then attempt to locate the mobile unit by broadcasting a paging message over an area associated with the last known position of the mobile unit. If the base station receives a paging response from the mobile unit, indicating that the mobile unit is in the area near the last known position, the base station may initiate a series actions and/or procedures to establish a wireless communication link with the mobile unit.
- the Radio Access Network may escalate the level of paging (e.g., broaden the paging area) by providing a paging signal to one or more areas proximate the area near the last known position. If the mobile unit continues to be unresponsive to the paging signal, paging signals may be broadcast to additional areas until the mobile unit is located or the number of allowed pages has been exhausted. This strategy for locating mobile units is conventionally referred to as “paging escalation.”
- FIG. 1 conceptually illustrates a conventional procedure 100 for paging a mobile unit (MU) and establishing a wireless communication channel.
- a mobile switching center MSC initiates the call flow by providing a page request to a base station (BS), as indicated by the arrow 105 .
- the base station provides a paging message in response to receiving the page request, as indicated by the arrow 110 .
- the mobile unit receives the page message, the mobile unit provides a page response message to the base station, as indicated by the arrow 115 .
- the base station acknowledges the page response message, as indicated by the arrow 120 , and provides a base station page response to the mobile switching center, as indicated by the arrow 125 .
- the base station may provide a base station traffic channel initialization message to the mobile unit, as indicated by the arrow 130 .
- the base station may also receive a page response message from the mobile switching center, as indicated by the arrow 135 .
- the base station may also transmit an alert message to the mobile unit, as indicated by the arrow 170 .
- the mobile unit may use the alert message to provide an alert signal, such as a ring, a vibration, a flashing light, and the like to the end user.
- the mobile unit may then connect to the base station, as indicated by the arrow 175 , and then the base station may provide an answer message to the mobile switching center, as indicated by the arrow 180 .
- alerting circuitry in a mobile unit such as the circuitry that provides ring tones, vibration, flashing lights, and the like, may be wired to an explosive device.
- the mobile phone and the explosive device may be placed in a vulnerable location such as a tunnel or a bridge and the explosive device may be detonated remotely by placing a call to the mobile unit.
- the wireless network may locate the mobile unit by transmitting a page message and may transmit an alert message in response to receiving a page response message from the mobile unit.
- an electrical signal may be provided to the alerting circuitry, which may transmit the signal to the explosive device, triggering detonation.
- the network impact caused by the paging escalation may be relatively small.
- the network impact of paging escalation may be significant if the designated security area is relatively large and the designated security area covers many cells.
- escalation of the paging area may cause a paging channel load increase on base stations neighboring the designated security area, as well as an increase in the network traffic load, an increase in the processor occupancy load, and the like. These increased loads may cause degradation of the overall system performance, which may increase the likelihood of blocking and/or call dropping.
- the present invention is directed to addressing the effects of one or more of the problems set forth above.
- the following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
- a method for blocking alert messages to mobile units.
- the method includes determining at least one location of at least one mobile unit based on at least one response to a first page message provided to the at least one mobile unit.
- the method also includes interrupting transmissions to the at least one mobile unit based on said at least one determined location of said at least one mobile unit.
- FIG. 1 conceptually illustrates a conventional call flow for paging a mobile unit (MU) and establishing a wireless communication channel;
- MU mobile unit
- FIGS. 3A and 3B conceptually illustrate first and second exemplary embodiments, respectively, of a designated security area, in accordance with the present invention.
- FIG. 4 conceptually illustrates one exemplary embodiment of a method of paging mobile units that may be in a designated security area, in accordance with the present invention.
- the software implemented aspects of the invention are typically encoded on some form of program storage medium or implemented over some type of transmission medium.
- the program storage medium may be magnetic (e.g., a floppy disk or a hard drive) or optical (e.g., a compact disk read only memory, or “CD ROM”), and may be read only or random access.
- the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The invention is not limited by these aspects of any given implementation.
- FIG. 2 conceptually illustrates one exemplary embodiment of a communication system 200 .
- the communication system 200 includes a network 205 , which may include any combination of wired and/or wireless networks operating according to any combination of wired and/or wireless protocols.
- the network 205 may include a portion that operates according to an Internet protocol and a portion that operates according to a Universal Mobile Telecommunication Services (UMTS) protocol.
- UMTS Universal Mobile Telecommunication Services
- the network 105 may include portions that operate according to a Public Switched Telephone Network (PSTN) protocol, a Plain Old Telephone System (POTS) protocol, a Code Division Multiple Access (CDMA, CDMA2000) protocol, a Bluetooth protocol, one of the IEEE 802 protocols, and the like.
- PSTN Public Switched Telephone Network
- POTS Plain Old Telephone System
- CDMA Code Division Multiple Access
- Bluetooth one of the IEEE 802 protocols, and the like.
- the network 205 may also include an optical portion including one or more fiber-optic cables and other supporting equipment.
- the network 205 is communicatively coupled to a mobile switching center 210 , which is completely coupled to a base station 215 .
- a mobile switching center 210 which is completely coupled to a base station 215 .
- the network 205 may include other elements not shown in FIG. 1 that may be used in addition to the mobile switching center 210 and/or the base station 215 or instead of the mobile switching center 210 and/or the base station 215 .
- the network 205 may be communicatively coupled to one or more routers, switches, radio network controllers, Mobile-IP Home Agents, base station routers, and the like.
- the mobile switching center 210 and the base station 215 are used to provide wireless connectivity to a geographical area, such as a cell or a portion of a cell.
- the base station 215 provides wireless connectivity to a single cell.
- the base station 215 may provide wireless connectivity to a geographic area that includes portions of more than one cell or, alternatively, to a geographic area that is a portion of a single cell.
- the base station 215 may include one or more beam-forming antennas that provide wireless connectivity to selected portions of a cell.
- the base station 215 may provide wireless connectivity to a geographic area that includes one or more designated security areas 220 .
- the designated security areas 220 may be defined in any manner.
- the designated security areas 220 may be defined to include bridges, buildings, military bases, and/or other locations that may be considered potential targets.
- Persons of ordinary skill in the art having benefit of the present disclosure should appreciate that the designated security areas 220 may be modified at any time.
- the geographical area encompassed by the designated security area 220 may only be considered a designated security area during periods of relatively high alert, such as during a time when the government has determined that a particular location may be at particularly high risk of attack.
- the designated security areas 220 may encompass one or more cells or may be included within a single cell.
- FIG. 3A conceptually illustrates a first exemplary embodiment of a designated security area 300 that includes at least a portion of each of a plurality of cells 305 . In the illustrated embodiment, some of the cells 305 are completely included in the designated security area 300 and portions of other cells 305 are included in the designated security area 300 .
- FIG. 3B conceptually illustrates a second exemplary embodiment of a designated security area 310 that is completely encompassed by a cell 315 .
- the boundaries of the designated security areas 300 , 310 depicted in FIGS. 3A and 3B do not correspond to the boundaries of the cells 305 , 315 , the present invention is not so limited.
- the designated security areas 220 may be defined so that their boundaries are approximately coincident with the boundaries of one or more cells.
- one or more mobile units 225 , 230 may be located within the wireless communication system 200 .
- the base station 215 may initiate communication with one or more of the mobile units 225 , 230 by providing a page message over an associated air interface 235 , 240 .
- page message may refer to a specific message having a specific format.
- the CDMA protocol defines a Page Message that may be broadcast by the base station 215 .
- page message will be used herein to refer to any message that may be broadcast to a geographic area that may include one or more mobile units 225 , 230 to indicate that the base station 215 is attempting to initiate communication with the corresponding mobile unit 225 , 230 .
- page message may include specific messages defined by particular protocols, but is not limited to these specific messages.
- the term “page response message” may refer to a specific message having a specific format.
- the CDMA protocol defines a Page Response Message that may be sent by the mobile units 225 , 230 .
- the term “page response message” will be used herein to refer to any message that may be transmitted by one or more mobile units 225 , 230 to indicate that the corresponding mobile unit 225 , 230 received a page message.
- the term “page response message” may include specific messages defined by particular protocols, but is not limited to these specific messages.
- the base station 215 and/or the mobile switching center 210 may determine one or more locations associated with the mobile units 225 , 230 based on the page response message.
- Techniques for determining locations of mobile units based on page response messages are known to persons of ordinary skill in the art. For example, if the boundaries of the designated security areas 220 correspond to the boundaries of one or more cells, the location of one or more of the mobile units 225 , 230 may be determined by determining whether a page response message was received in response to a page message provided to one or more cells. For another example, the location of one or more of the mobile units 225 , 230 may be determined by measuring the round-trip delay between the one or more mobile units 225 , 230 and the base station 215 using timing information included in the page response message. Accordingly, in the interest of clarity only those aspects of determining the location of one or more of the mobile units 225 , 230 that are relevant to the present invention will be discussed further herein.
- the page response message may be used to determine that the mobile unit 225 is not within the designated security area 220 .
- the mobile switching center 210 and/or the base station 215 may therefore establish one or more traffic channels over the air interface 235 .
- the base station 215 may provide a traffic channel assignment message and/or an alert message over the air interface 235 .
- the page response message may be used to determine that the mobile unit 230 is within the designated security area 220 .
- the mobile switching center 210 and/or the base station 215 may therefore interrupt the call flow associated with the mobile units 230 .
- the base station 215 may prevent transmission of a traffic channel assignment message and/or an alert message to the mobile unit 230 over the air interface 240 .
- FIG. 4 conceptually illustrates one exemplary embodiment of a method 400 of paging mobile units that may be in a designated security area.
- one or more mobile units may be paged (at 405 ) by transmitting or broadcasting a page message.
- the one or more mobile units may be paged (at 405 ) by broadcasting the page message to at least one geographic area where the mobile units are expected to be located.
- Whether or not a page response is received from one or more of the mobile units may then be determined (at 410 ).
- a base station may wait a predetermined amount of time for a page response and, if no response is received in the predetermined amount of time, may determine (at 410 ) that the mobile units are not going to provide a page response. If no response is received, then another page may be broadcast to one or more additional geographic areas. In one embodiment, additional page messages may be broadcast until a maximum number of attempts has been reached.
- DSA designated security area
- locations of the responding mobile units may be determined and compared to the locations included in a designated security area. If the mobile unit is not in a designated security area, then a traffic channel assignment may be provided (at 420 ). Additional messages, such as alert messages, may also be provided (at 420 ). If one or more of the mobile units is in a designated security area, then call flows associated with the mobile units may be interrupted (at 425 ). For example, traffic channel assignment messages and/or alert messages may be blocked (at 425 ). Consequently, mobile units in the designated security area may not receive traffic channel assignment messages and/or alert messages and therefore may not take any action to alert a user of the mobile phones, such as ringing, vibration, flashing lights, and the like.
- the likelihood that a mobile phone located in the designated security area may be put to malicious use may be reduced.
- the possibility that the alert circuitry in mobile units in the designated security area may be used to trigger an explosive device may be reduced.
- the network impact of paging escalation caused by blocking page messages to mobile phones in the designated security area may be reduced because the mobile phones in the designated security area remain visible to the wireless communication system 200 .
- the techniques described above may reduce paging channel loads on base stations neighboring the designated security area, network traffic loads, processor occupancy loads, and the like. Reducing these loads may reduce the likelihood of blocking and/or call dropping.
Abstract
Description
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US11/304,066 US7602793B2 (en) | 2005-12-15 | 2005-12-15 | Method of blocking alert messages to mobile units |
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US11/304,066 US7602793B2 (en) | 2005-12-15 | 2005-12-15 | Method of blocking alert messages to mobile units |
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US20070140186A1 US20070140186A1 (en) | 2007-06-21 |
US7602793B2 true US7602793B2 (en) | 2009-10-13 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080254814A1 (en) * | 2007-04-16 | 2008-10-16 | Motorola, Inc. | Method for effective fast re-paging in a wireless communication network |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080294798A1 (en) * | 2007-05-23 | 2008-11-27 | Lynch Thomas W | Portable electronic device management |
US8626203B1 (en) * | 2009-09-25 | 2014-01-07 | Sprint Spectrum L.P. | Method and system for differentiated paging channel selection |
US20130217422A1 (en) * | 2012-02-16 | 2013-08-22 | Gaguk Zakaria | System and method for enhanced paging and quality of service establishment in mobile satellite systems |
US10212692B2 (en) | 2017-02-10 | 2019-02-19 | Hughes Network Systems, Llc | Enhanced paging in 4G LTE mobile satellite systems |
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US4829554A (en) * | 1985-01-31 | 1989-05-09 | Harris Corporation | Cellular mobile telephone system and method |
US20020198025A1 (en) * | 1995-10-26 | 2002-12-26 | Jeffrey Brownlee | Radio telephone system |
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US9485750B2 (en) * | 2007-04-16 | 2016-11-01 | Google Technology Holdings LLC | Method for effective fast re-paging in a wireless communication network |
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US20070140186A1 (en) | 2007-06-21 |
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